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Advanced Analog Technology, Inc.
AAT1108
Preliminary and Provisional
2-CHANNEL STEP-UP PWM CONTROLLERS WITH ADJUSTABLE LDO
Features Complete PWM Power Control Circuitry Adjustable LDO Regulator Under-voltage Lockout Protection Totem pole Output Output Short Circuit Protection Dead Time ControlG 0 to 100% Wide Operating FrequencyG 10kHz to 800kHz General Description The AAT1108 series provides an integrated two-channel pulse-width-modulation (PWM) solution for the power supply of DC-DC system, this device offers the systems engineer the flexibility to tailor the power supply circuitry to a specific application. Each channel contains its own error amplifier, PWM comparator, dead-time control and output driver. The under-voltage protection, oscillator, short circuit protection and voltage reference circuit are common for the two channels. The AAT1108 contains two boost (step-up) exclusive circuits. Dead-time control (DTC) can be set to provide 0% to 100% dead time by resistive divider network. Soft start can be implemented by paralleling the DTC resistor with a capacitor. Two dead time control inputs are assigned for Ch-1 and Ch-2 individually, and dead time control inputs can be used to control on / off operation. The maximum output currents of LDO regulator can be enlarged by connect a N_MOS FET (or NPN bipolar) as a source follow stage at out3 pin.
*Spec is subject to change without notice in this document.
Pin Configuration
TOP VIEW
CT RT INV3 INV1 FB1 DTC1 OUT1 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Vref SCP OUT3 INV2 FB2 DTC2 OUT2
VDD
(TSSOP-16 PACKAGE)
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Advanced Analog Technology, Inc.
AAT1108
Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name CT RT INV3 INV1 FB1 DTC1 OUT1 GND VDD OUT2 DTC2 FB2 INV2 OUT3 SCP Vref I/O I External timing capacitance I External timing resistance I Negative input for LDO amplifier I Negative input for error amplifier 1 I Output for error amplifier 1 I Output 1 dead time / soft start setting O Output 1 Ground I Power supply O Output 2 I Output 2 dead time / soft start setting I Output for error amplifier 2 I Negative input for error amplifier 2 I LDO output I Timer latch setting O Reference voltage (2.505V) output Description
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Advanced Analog Technology, Inc.
AAT1108
Absolute Maximum Ratings CHARACTERISTICS Supply voltage Input voltage (IN-, DTC) Output voltage SYMBOL VDD VI VO VALUE 7 UNIT V V V
VDD VDD +0.3 -120/+120 -20 to 85 -65 to 150 500
Output current Operating free-air temperature range Storage temperature range Power dissipation
Recommended Operating Conditions
IO
Tope Tstg
mA
o o
C C
Pd
mW
Supply voltage, VDD Input voltage, INV1, INV2, INV3 Output voltage OSC capacitor OSC resistor (Note 1) Oscillator frequency Output current, Iout1, Iout2 Out put current, Iout3 (Vout3 = 3.3v) Operating free-air temperature
Symbol VDD Vcm VO
Min 4.0 0.5 0
CT RT f OSC
100 5.1 10
Max 6.5 1.6 VDD 15000 50 800
Unit V V V
pF k[ kHz mA mA
o
IO2 IO3
Tope
+50/-50 +30 -20 85
C
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Advanced Analog Technology, Inc.
AAT1108
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) Oscillator
Parameter Test Condition
Frequency Frequency change with VDD
f OSC f dV
C T = 220pF, R T = 10k[ VDD = 4.0V to 6.0V, TA = 25 oC C T = 220pF, R T = 10k[
Min 320
Typ 400
Max Unit 480 KHz
1
%
Under-voltage Protection
Parameter Test Condition Min Typ Max Unit
Upper threshold voltage Lower threshold voltage Hysteresis ( VUPH - VUPL )
Short Circuit Protection Control
Parameter
VUPH VUPL VHYS
TA = 25 C TA = 25 oC TA = 25 oC
o
2.6 2.23
2.9 2.53 0.37
3.2 2.83
V V V
Test Condition
Min
Typ
Max
Unit
Input threshold voltage Short-circuit detect threshold voltage SCP terminal source current Standy Voltage Latch Voltage
Vr1
Ch-1, 2
2.1 1.48 -1.5
2.4 1.64 -2.5 50 30
2.65 1.8 -3.5 100 100
Vr 2
I SCP VSTB VLT
V V A mV mV
Note1: Typical values of all parameters are specified at
TA =25 oC.
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Advanced Analog Technology, Inc.
AAT1108
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Reference Voltage
Parameter Test Conditions Min
o
Typ
Max
Unit
Internal reference Voltage Reference voltage Input voltage regulation Output regulation
Vrefi
I REF = -1mA , TA = 25 C 1.220 I REF = -1mA , TA = 25 oC I REF = -1mA , VDD = 4.0V to 6.0V I REF = -0.1mA to -1mA
1.233 1.246 V mV mV
VREF VRI
VRO
2.430 2.505 2.580 1 1 5
EA (Error Amplifier)
Parameter Test Condition
Min
Typ
Input offset voltage Input bias current Input voltage range Open-loop voltage amplification Output voltage swing Output sink current Output source current
VIO I IB VIR A VD VOM + VOM - I OM + I OM -
Ch-1,2, AV=1 Ch-1,2 Ch-1,2 15 0.5 70 2.3 FB=1.25V FB=1.25V 3 -45 60 85 2.5 0.7 20 -75 80
Max Unit 6 mV
100 1.6
nA V dB V
0.9 mA A dB
Common-mode rejection ratio CMRR
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Advanced Analog Technology, Inc.
AAT1108
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Dead Time Control & PWM Parameter Test Condition Min Typ Max Unit 0.1 1 A Input bias current I BDT VDTC = 2V
Input threshold voltage (DTC) Latch input voltage Latch mode source current
Output Stage
Parameter
Vd 0 Duty = 0%, f OSC = 10kHz Vd100 Duty = 100%,
VDT IDT f OSC = 10kHz IDT = 100A
1.38 1.87
1.48 1.97 0.1
1.58 2.07 0.3
V
V A
DTC1,2=2.0V
200
500
Test Condition
High-level output voltage Low-level output voltage Rise time Fail time Leakage current
Operating Current
Parameter
VOH VOL Trise Tfail Ipeak
IO=-50mA IO=+50mA CL=1000pF CL=1000pF Vo =6.0V
Min 3.6
Typ 4.0 0.8 100 100
Max Unit V 1.2 V nS nS 5 A
Test Condition
Min
Supply current
I DD-OFF I DD-ON
Output "OFF" state PRT =10 k
Typ 1.8
Max Unit mA
2.0
mA
LDO (Vout3 = 3.3V)
Parameter Test Condition
Output voltage Line Regulation Load Regulation
Vrd LRI LRO
VDD=5V,Vout3=3.3V VDD=4V~6.5V, Iout3=10mA Iout3=1mA~30mA
Min 3.17
Typ 3.3 0.08
Max Unit 3.43 V 0.3 %
0.1
%
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Advanced Analog Technology, Inc.
AAT1108
Function Block Diagram
FB1 INV1
VDD
Err-Amp 1.233V Vrefi
Scpcomp PWM
OUT1
GND
Vr1
Vrefi 1.233V
UVC
VDD
INV2 FB2 DTC1
Err-Amp PWM
OUT2
CT
UVC
DTC2
UVC
OSC
RT
UVC LATCH VDD LATCH
UVLO
VDD
SCP INV3
SCP
UVC Vrefi 1.253V Vref
OUT3
VREF
Vref
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Advanced Analog Technology, Inc.
AAT1108
Application Circuit 1
VDD
C11 L1
U1 VDD
VP1 D1
VP1
C9 VDD
OUT1
C1 R5
Q1
FB1
R1
INV1
R2
L2 D2
VP2
AAT1108
VP2 C2 R6
Q2 C10
OUT2 FB2
R3
INV2
R4
OUT3
R11
VP3
INV3
R12 C12
VREF
C20 R9 R7
CT DTC1 RT DTC2 GND SCP
RT C3 CT
C5
R10
R8
C4
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Advanced Analog Technology, Inc.
AAT1108
Application Circuit 2
VDD
C8 C11 L1
option circuit 1: charge pump circuit
VN3
D4 D3 C7
U1 VDD
VP1 D1
VP1
C9 VDD
OUT1
C1 R5
Q1
FB1
R1
INV1
R2
L2 D2 Q2
VP2
VP2
C2
R6
OUT2 FB2
C10
R3
VDD INV2 OUT3
R11 Q3
R4
VP3
AAT1108
INV3 VREF
C20 R9 R7
C12 R12
CT DTC1 RT DTC2 GND SCP
RT C3 CT
option circuit: enlarge output current
C5
R10
R8
C4
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Advanced Analog Technology, Inc.
AAT1108
Boost ] Step-up^ Timing Chart
2.V4 1.V79
DTC CT FB
1.V84
TT U O M WP U P
TT UO UP
1.V46
SCP
tDT
SCPCP MO
2.V35
V DD
ockout ree L f
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Advanced Analog Technology, Inc.
AAT1108
Package Dimension (Unit: Mil)
D
A1
A A2
E E1
12X
e
b
y
D IM E N S IO N S
IN
M IL L IM E T E R S
D IM E N S IO N S
IN
IN C H E S
A A1 A2 b C D E E1 e L y K
M IN 1 .0 5 0 .0 5 0 .2 0 4 .9 0 6 .2 0 4 .3 0 0 .5 0
NOM 1 .1 0 0 .1 0 1 .0 0 0 .2 5 0 .1 2 7 5 .0 7 5 6 .4 0 4 .4 0 0 .6 5 0 .6 0 4
MAX 1 .2 0 0 .1 5 1 .0 5 0 .2 8 5 .1 0 6 .6 0 4 .5 0 0 .7 0 0 .0 7 6 8
M IN 0 .0 4 1 0 .0 0 2 0 .0 0 8 0 .1 9 3 0 .2 4 4 0 .1 7 0 0 .0 2 0
NOM 0 .0 4 3 0 .0 0 4 0 .0 3 9 0 .0 1 0 0 .0 0 5 0 .1 9 9 8 0 .2 5 2 0 .1 7 3 0 .0 2 6 0 .0 2 4 4
MAX 0 .0 4 7 0 .0 0 6 0 .0 4 1 0 .0 1 1 0 .2 0 0 0 .2 6 0 0 .1 7 7 0 .0 2 8 0 .0 0 3 8
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